Just picked up a DMPS LR-308 AP4 last week that I had on layaway for five months from a dealer on GunBroker.com. Spent the last few days lurking here... as this is my first "black gun", my mind is just reeling from all the info on this site!!! This part works with this part if that number lines up with this dimension and...... well, you all get the point. You all seem like a good bunch that enjoy passing on what you've learned over the years, and in advance I will say thank you and I'll try not to remain a "black gun" idiot for too long.... Merry Christmas and a Happy New Year to all!!